S
M
T
W
T
F
S
30
77°
62°
31
77°
61°
1
84°
61°
2
81°
59°
3
76°
57°
4
83°
61°
5
84°
61°
6
84°
60°
7
83°
60°
8
84°
59°
9
82°
61°
10
78°
61°
11
78°
60°
12
77°
50°
13
81°
57°
14
78°
48°
15
80°
47°
16
79°
44°
17
72°
51°
18
72°
47°
19
76°
44°
20
70°
46°
21
70°
45°
22
68°
43°
23
73°
44°
24
77°
44°
25
77°
53°
26
78°
53°
27
78°
46°
28
74°
52°
29
73°
43°
30
73°
53°
1
76°
39°
2
76°
38°
3
72°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mount Pleasant
Mount Pleasant's September 2026 forecast shows daily high temperatures ranging from 68° to 84°, with overnight lows between 38° and 62°. The average high for September is 77° with an average low of 52°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Mount Pleasant. See also: October | November | December.
